mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-06 00:05:02 -05:00
8a84e134cc
Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
90 lines
3.4 KiB
Python
90 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Aspect.py
|
|
---------------------
|
|
Date : October 2016
|
|
Copyright : (C) 2016 by Alexander Bruy
|
|
Email : alexander dot bruy at gmail dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Alexander Bruy'
|
|
__date__ = 'October 2016'
|
|
__copyright__ = '(C) 2016, Alexander Bruy'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
import os
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
|
|
from qgis.analysis import QgsAspectFilter
|
|
from qgis.core import (QgsProcessingParameterRasterLayer,
|
|
QgsProcessingParameterNumber,
|
|
QgsProcessingParameterRasterOutput,
|
|
QgsProcessingOutputRasterLayer,
|
|
QgsFeatureSink)
|
|
from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
|
|
from processing.core.parameters import ParameterRaster
|
|
from processing.core.parameters import ParameterNumber
|
|
from processing.core.outputs import OutputRaster
|
|
from processing.tools import raster
|
|
from processing.tools.dataobjects import exportRasterLayer
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class Aspect(QgisAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
Z_FACTOR = 'Z_FACTOR'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'dem.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Raster terrain analysis')
|
|
|
|
def __init__(self):
|
|
super().__init__()
|
|
|
|
self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT,
|
|
self.tr('Elevation layer')))
|
|
self.addParameter(QgsProcessingParameterNumber(self.Z_FACTOR,
|
|
self.tr('Z factor'), QgsProcessingParameterNumber.Double,
|
|
1, False, 1, 999999.99))
|
|
self.addParameter(QgsProcessingParameterRasterOutput(self.OUTPUT, self.tr('Aspect')))
|
|
self.addOutput(QgsProcessingOutputRasterLayer(self.OUTPUT, self.tr('Aspect')))
|
|
|
|
def name(self):
|
|
return 'aspect'
|
|
|
|
def displayName(self):
|
|
return self.tr('Aspect')
|
|
|
|
def processAlgorithm(self, parameters, context, feedback):
|
|
inputFile = exportRasterLayer(self.parameterAsRasterLayer(parameters, self.INPUT, context))
|
|
zFactor = self.parameterAsDouble(parameters, self.Z_FACTOR, context)
|
|
|
|
outputFile = self.parameterAsRasterOutputLayer(parameters, self.OUTPUT, context)
|
|
|
|
outputFormat = raster.formatShortNameFromFileName(outputFile)
|
|
|
|
aspect = QgsAspectFilter(inputFile, outputFile, outputFormat)
|
|
aspect.setZFactor(zFactor)
|
|
aspect.processRaster(feedback)
|
|
|
|
return {self.OUTPUT: outputFile}
|